修复DelimiterBasedFrameDecoder中保留分隔符产生的空报文,修改exceptionCaught日志输出

src/main/java/io/github/yezhihao/netmc/TCPServerHandler.java

@@ -90,7 +90,7 @@ public class TCPServerHandler extends ChannelInboundHandlerAdapter {
     @Override
     public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) {
         Session session = ctx.channel().attr(Session.KEY).get();
-        log.warn("<<<<<异常断开连接" + session, e);
+        log.warn("<<<<<消息处理异常" + session, e);
     }
 
     @Override

src/main/java/io/github/yezhihao/netmc/codec/DelimiterBasedFrameDecoder.java

@@ -84,7 +84,11 @@ public class DelimiterBasedFrameDecoder extends ByteToMessageDecoder {
                 }
                 buffer.skipBytes(minDelimLength);
             } else {
-                frame = buffer.readRetainedSlice(minFrameLength + minDelimLength);
+                if (minFrameLength != 0) {
+                    frame = buffer.readRetainedSlice(minFrameLength + minDelimLength);
+                } else {
+                    buffer.skipBytes(minDelimLength);
+                }
             }
 
             return frame;